Feature: 1. Turn signal delay module controls the outer turn signal slightly time‑delayed to produce special effects. 2. Adjustable delay level, total 10 levels from 0 to 9, "0" means no delay, increasing by 1 level in turn means the delay is superimposed by 10ms. 3. Dynamic turn signal wiring harness allows you to get a distinctive and unique appearance of your car. 4. Specially fit for 3 Series F30 LCI 2016‑2019, for 3 Series GT F34 LCI 2016‑2019, for F80 M3 LCI 2016-2018. 5. Plug‑and‑play harness can produce the desired effect without coding, easy to install. Specification: Item Type: Dynamic Turn Signal Blinker Module Material: PBT+FEPType: 4-PinQuantity: Pair(Left+Right)Installation: Plug and Play Fitment:Fit for 3 Series F30 LCI 2016-2019 Fit for 3 Series GT F34 LCI 2016-2019 Fit for F80 M3 LCI 2016-2018 (Only For Taillight With Following OE Number: 63217369117 / 63217369118 63217456519 / 63217456520 63217369115 / 63217369116 63217456517 / 63217456518 63217372209 / 63217372210 63217417469 / 63217417470 63219448189 / 63219448190). Package List: 1 x Pair of Dynamic Turn Signal Module(Left+Right)1 x Manual Note: Professional Installation is Highly Recommended Please confirm whether the OE number of your original taillight is within this compatibility.